Water-heater.



E. ROTH.

WATER HEATER.

APPLIOATIOH FILED 001'. 2a, 1912.

1,084,562. Patented Jan. 13, 191

v sa 7 v Witnesses lfive n25)",

COLUMBIA PLANOGRAIH C0..\\'ASHINGTON. D, c

UNITED $TATES PATENT OFFICE.

Enema ROTH, or scHoNEBERG, NEAR BERLIN, GERMANY.

WATER-HEATER.

To all whom it may concern:

Be it known that I, EUonN ROTH, a citizen of the Empire of Germany, and residing at Schoneberg, near Berlin, Germany, have invented certain new and useful Improvements in ater-Heaters, of which the following is a specification.

My invention relates to a water-heater by which the water to be heated is continuously raised to the boiling point and in which the hot water discharged is continuously replaced by the introduction of cold water.

Important objects of my invention are to heat the liquid intensively and to secure great safety in operation. I attain these ends firstly by utilizing the hot gases to the greatest possible advantage, and secondly by giving a special form and arrangement both to the heating ribs or projections as well as to the channels conducting the water.

The entire water-heater according to my invention consists of one single casting, preferably of aluminium, as this though admittedly a poorer conductor of heat than copper, dissipates the heat more quickly. The operation of my heater is improved still more by the application of the counter-current principle. The water is introduced into a spiral channel on the upper side of the heater-plate, while on the lower side are arranged radial ribs or projections between which the hot gases pass. By employing one single casting as the heater-plate considerable safety of working is obtained due to the impossibility of parts becoming unsoldered, and owing to using open channels there is no possibility of an explosion such as might readily occur if the water were conducted through a closed vessel for example.

Tests have shown that the empty apparatus according to my invention cannot be damaged even by continued heating. The reason is that the aluminium dissipates the heat so rapidly that a zone at a temperature at which the metal in question would melt cannot be formed in immediate proximity to the flame.

One illustrative embodiment of my invention is represented by way of example in the accompanying drawing, wherein Figure l is a top plan view, Fig. 2 a bottom plan view, and Fig. 3 a vertical sect-ion taken on the line AB in Fig. 1.

Referring to the drawing, 6 designates Specification of Letters Patent.

Patented J an. 13, 1914.

Application filed October 29 1912. Seria1 No. 728,389.

heated, and e the discharge pipe for the hot water. The ribs 0 extend outwardly either radially or in a direction at an angle thereto. The flames and hot gases from the burner impinge against the ribs 0 and projections 9 carried by the plate 6, and in this way the effective heating surface is materially increased, the heat from which surface is imparted to the water flowing in the channels a. It is obvious that other means may be used to increase the eifective heating surface of the plate and still be within the purview of this invention. In order to simplify manufacture and specially the finishing of this channel it is preferably not made exactly in the form of a spiral, but given an annular form, its various parts being connected one with another in the manner clearly shown in the drawing.

According to the type of burner employed for applying the heat, the cold water is introduced either into the outer or into the inner part of the apparatus. In the example represented in the drawing, a burner is employed in which the heated gases flow from the center outwardly. In this event, the water is introduced at the part designated f, flows through the channel a, reaches the central space 9 and then flows away through the pipe 6.

The heater-plate Z) and the walls of the channels a may be made of any desired contour, the form illustrated being but one specific embodiment of my invention. This plate is preferably made of aluminium or an alloy of aluminium, which will dissipate heat very rapidly.

This apparatus can be cleaned out particularly easily and may be closed, if desired, by a single lid or cover h. It is then only necessary to remove the lid when, by the application of a brush or other suitable appliance, the channel can be readily cleaned.

I claim 1. As a new article of manufacture, a counter-current water-heater comprising an open spiral channel for water and passages for hot gas below and repeatedly crossing said channel in immediate proximity thereto, the passages for gas being formed by projections on the bottom of said channel.

2. As a new article of manufacture, a channel on the top thereof, and radial ribs counter-current Water-heater composed of a on the bottom thereof. plate having an open spiral channel on the In testimony whereof, I afiix my signature top thereof, and radial ribs on the bottom in the presence of tWo Witnesses.

5 thereof. EUGEN ROTH.

3. As a new article of manufacture, a Witnesses: counter-current Water-heater composed of HENRY HASPER, an aluminium plate having an open spiral WOLDEMAR HAUPT.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of I'atents, Washington, D. G. 

